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[sumo-user] Using random seed
  • From: "Bae, Jong In" <jbae42@xxxxxxxxxx>
  • Date: Wed, 3 Mar 2021 19:09:55 +0000
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  • Thread-topic: Using random seed
Hello,

I've been working on using random seed and had some questions. I'm having trouble seeing the difference between before and after I assigned a random seed value.
I attached a screenshot of my sumocfg file just in case my syntax is incorrect.
  1. How is sigma different than speedDev?
  2. According to this link (https://sumo.dlr.de/docs/Simulation/Randomness.html#random_number_generation_rng), I should be seeing randomness in loading vehicles. 
    To my understanding, I should expect to see randomness in the following two areas: (1) the entry time when vehicles enter the scenario should be different and (2) the sequence in vehicle type in vTypeDistribution should be different.

    However, I am not seeing any difference in the vehicles' entry time or the sequence in vehicle type in vTypeDistribution. But I am seeing randomness in speed (tested with only one vehicle also). So I think the random seed is in effect. I'm just not sure why I am not seeing randomness in the two areas mentioned above.
Thank you so much for the help!

Attachment: sumocfg.PNG
Description: sumocfg.PNG

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